The hydraulic flywheel accumulator, a novel hydrokinetic energy storage device, consists of a piston-style hydraulic accumulator which rotates at high speed about the longitudinal axis. In comparison to traditional accumulator storage, this rotation significantly increases energy density and decouples system pressure from state-of-charge. Angular acceleration during operation causes the fluid within the device to depart from rigid body rotation. It is important to model the resultant three-dimensional flow, as it has implications on viscous energy dissipation and transient response of accumulator pressure. The computational cost of a full CFD simulation makes it undesirable for modeling and optimization. This paper details the development of a simplified quasi-empirical model for fluid behavior in the hydraulic flywheel accumulator.
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